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CityLab. (September 20, 2018). Track length of metro systems worldwide in 2017, by region (in kilometers) [Graph]. In Statista. Retrieved April 18, 2021, from https://www.statista.com/statistics/556111/metro-networks-worldwide-track-distribution/
CityLab. "Track length of metro systems worldwide in 2017, by region (in kilometers)." Chart. September 20, 2018. Statista. Accessed April 18, 2021. https://www.statista.com/statistics/556111/metro-networks-worldwide-track-distribution/
CityLab. (2018). Track length of metro systems worldwide in 2017, by region (in kilometers). Statista. Statista Inc.. Accessed: April 18, 2021. https://www.statista.com/statistics/556111/metro-networks-worldwide-track-distribution/
CityLab. "Track Length of Metro Systems Worldwide in 2017, by Region (in Kilometers)." Statista, Statista Inc., 20 Sep 2018, https://www.statista.com/statistics/556111/metro-networks-worldwide-track-distribution/
CityLab, Track length of metro systems worldwide in 2017, by region (in kilometers) Statista, https://www.statista.com/statistics/556111/metro-networks-worldwide-track-distribution/ (last visited April 18, 2021)
